Ejecting mechanism for headers



Jan. 27, 1942. J, H, FRIEDMAN 2,271,257

EJECTING MECHANISM FOR HEADERS Filed Dec. 30, 1939 INVENI'OR JOHN Hf'lP/fD/VA/V ATTQRNEYS Patented Jan. 27, 1942 EJECTING MECHANISM FORHEADERS John Henry Friedman, Tii'lin, Ohio, assignor to The NationalMachinery Company, Tiilin, Ohio, a corporation of Ohio ApplicationDecember 30, 1939, Serial No. 311,748

' (cl. 1o 11) 12 Claim.

This invention relates to heading or upsetting machines for makingbolts, nuts, rivets and like articles, and more particularly to means tofree the article from a punch or tool carried by a reciprocating member.

Machines of this type, such as cold headers, normally embody bed framescarrying dies in which the work is held, and reciprocating slides drivenby cranks and carrying punches or heading tools for upsetting andshaping the blanks supported in the bed frame dies. In some instances itbecomes desirable or necessary to provide means to free or eject theblanks from the tools carried by the reciprocating slide to prevent theblanks sticking in these tools. This situation becomes particularlyacute in case the punch or tool carried by the header slide is arrangedto shape the upset-portion into hexagonal orother special shape, becauseof the frictional grip set up by the forcing of the metal into thecorners of the recess in the heading punch. Likewise, in other forms ofheading punches it may be desirable to provide means to free the blankfrom the punch to insure against the blank being carriedout of th die.

The principal objects of the present invention are to prevent blanksfrom sticking in a tool or heading punch carried by a reciprocatingslide; to improve and simplify an ejector or knocknout mechanismapplicable to such a tool or punch;

to operate the knockout by motion derived from the driving mechanismwhich reciprocates the slide; to providea knockout suitable for use oneither single or double blow headers; and to provide asimple adjustmentby which the stroke and position of the knockout member may be varied tofit any particular die set-up or adjustment. Other objects will appearin the following detailed description of one embodiment (it theinvention. I,

In the accompanying drawing:

Figure 1 is a longitudinal section through the center of a heading slideand punch embodying a knockout constructed in accordance with thisinvention and showing the crank at its forward dead center.

Figure 2' is a view corresponding to Figure 1 after the crankshaft hasrotated 90 on the return stroke from the position shown in Figure 1.

The invention is shown applied to a double stroke header of the typeillustrated in my Patent No. 1,955,061, although it is to be understoodthat it may be applied equally well to various other types of headingmachines such as single biow or multiple station machines. The die isfixed in the bed frame of the machine in the usual manner and isprovided with an opening 6 to receive. the shank of a blank to be headedor otherwise operated upon by the tools carried by the reciprocatingslide. A reciprocating header slide I is mounted to slide in suitableways in the bed frame toward and away from the die 5 and is driven by apitman 8 journalled at one end to a wrist pin 9 carried in the slide andat th other end to a crank pin III formed in a crankshaft journalled inthe bed frame and rotated by suitable power means in the usual manner.

In the illustrated embodiment the slide, I is formed with an opening llslidably receiving a block l2 which may be adjusted toward and away fromthe die 5. On its rearward side the block I! bears against a verticallyadjustable wedge l3 which bears in a wedge shaped opening I in theslide 1. An adjusting screw I5 is pro- 'vided to vertically adjust thewedge IS. A lockslide I and against the wedge l3 in the adjustedposition determined by the setting of the wedge from th center linethereof, and carries a pair of heading punches which may be alternatelyaligned with the center of the slide I and with the die 5 by oscillationof the punch rocker l1.

Oneof the heading punches carried by the punch rocker I1 is shown at I8.As illustrated this punch I8 is the final or heading punch for atwo-blow machine and is formed with a hexagonal recess I! to upset andshape into hexagonal form the projecting end of a blank B carried in thebore 6 of the die 5. The punch I8 is also illustrated as being formed ofthree sections suitably secured together, each having an axially.extending bore formed therein to receive and guide a knockout pin 20which extends into the recess IS, a tappet 2| which engages the end ofthe pin 20 and a pin 22 which extends through the punch rocker l1 andengages the tappet 2|.

The block I2 is formed with a vertical bore 23 terminating near thelower part of the block in an enlarged bore 24. A rod 25 extends looselythrough the bore 23 into the bore 24 and is supported at the upper faceof the block 12 by v a washer 29 having a spherical lower face bearingin a. correspondingly formed recess in the punch l9 in which a lever 3!is pivotally supported by a pin 32. The lever 3| is shown as providedwith a cam surface 33 for engagement with the end of the pin 22.

A pin 34 is slidably supported in the lower portion of the block l2 withits forward end projecting into the slot 39 in engagement with the lowerend of the lever 3i and its rearward end projecting into the enlargedbore 24 in position to engage one side of the wedge 29. Another pin 35in alignment with the pin 39 is also slidably supported in the block [2and in the slide 1 with its forward end projecting into the enlargedbore 24 in position to engage the rearward side of the wedge 29 and itsrearward end projecting through the slide 1 and into the space in whichthe pitman 8 operates. The wedge l3 may be provided with a slot 36 sothat the portions of the wedge on opposite sides of the slot straddlethe pin 35.

The forward end of the pitman 8 is provided with a bearing boss or thelike 31 which is journalled on the wrist pin 9. A recess 39 is cut inthis boss and a hardened button or similar'engaging member 39 issupported in the recess in alignment with the rearward end of the pin35. The forward face of the button 39 is preferably rounded off as shownto insure proper contact with the end of the pin 35.

In each of Figures 1 and 2 the point A represents the axis ofthecrankshaft and the point C represents the center line of the crank pin19. The dot-and-dash circle D represents the path of movement of thecenter of the crank pin C about the center of the crankshaft A, and thpoint E represents the center of the wrist pin 9.

When the crank pin I9 is on its forward dead center, as illustrated inFigure 1, the punch I8 is advanced into its most forward position andthe wedge I3 is adjusted so that in this position the punch l8 willcomplete the heading operation desired to be performed by it. As thecrankshaft rotates in the direction indicated by th arrows, the slide 1is drawn rearwardly away from the die 5 and at the same time the pitman8 rocks about the wrist pin 9 so that the center line CE of the pitmanturns through an angle with respect to the line A-E connecting thecenters of the wrist pin and crankshaft, and the button 39 is therebyswung upwardly about the center of the wrist pin E through acorresponding angular movement. The limit of this relative oscillationof the pitman about the center of th wrist pin E in one direction isrepresented in Figure 2 after the crank'has moved through 90 from theforward dead center position illustrated in Figure 1. This movement ofthe button 39 about the center E caused by the oscillation of the pitmanmoves the pin 35 forwardly through its guiding apertures in the slide 1and the block l2, swinging the rod 25 forwardly and pushing the pin 39forward through the engagement of the pins 34 and 35 with the wedge 29.This movement of the pin 39 swings the lower end of the lever 3| forwardcausing the cam surface 33 thereof to push the pin 22, which in turnpushes the tappet 2i and the knockout pin 29 forwardly so that the endof the knock-out pin 29 enters the recess l9 in the punch l9 and ejectsthe head or upset which was formed in the recess [9.

In use the block [2 is fixed in a desired adjusted position by means ofthe adjusting wedge l3 and the locking screw l9 so that the punch l9projects forwardly the desired amount. It is preferred to then place theparts in the forward dead center position and adjust the rod 25vertically by means of the adjusting nut 21 so that all of the parts inthe knockout train from th button 39 to the knockout pin 29 are incontact, and the pin 29 is in its retracted position in the bottom ofthe recess i9. The adjusting nut 21 on the rod 25 is then looked inposition and it will be apparent that as soon as the rearward stroke ofthe slide begins, the knockout train begins to move relative to theslide 1. For most purposes it is desired to select a position for thebutton 39, and lengths for the respective lever arms from the point ofcontact of the pin 34 with the lever 3! to the pivot 32, and from thecam surface 33 to the pivot 32, so that the forward end of the knockoutpin 29 remains stationary with respect to the die 5 as the slide Ibegins to recede. In this way the head or upset formed in the recess I9is ejected from the recess simultaneously with the rearward movement ofthe punch and the blank is held in its proper position in the bore 6 ofthe die 5. It will be apparent than when, for any reason, it isnecessary to change the position of the block l2, as to accommodate apunch of slightly different length, by manipulation of the mainadjusting wedge N, the length of the s knockout train may be changed byvertical adjustment of the rod 25 so that the wedge 29 increases ordecreases the spacing between the ends of the pins 34 and 35. Likewiseif, for any reason, it is desired to delay the time of ejecting theblank from the punch until the punch has receded a short distance fromthe die 5, lost motion may be provided in the knockout train by loweringthe rod 25 and wedge 29 so that the pin 35 must mov into contact withthe wedge 29 before the knockout action begins.

It will be apparent that as the crankshaft continues to rotate from theposition shown in Figure 2 the slide continues to recede until thecrankshaft reaches its rearward dead center position. During the ofrotation of the crankshaft from the position shown in Figure 2 thebutton 39 is moved until it again occupies the position shown inFigure 1. During the next of rotation constituting the forward stroke ofthe slide 1 the button 39 is moved away from the end of the pin 35. Thuswhen the punch I9 approaches the die 5 to perform the next headingoperation the knockout pin 29 and tappet 2| are free to be movedrearwardly until the tappet 2| seats in the rearward side of itsenlarged bore in the punch, at which time the forward end of theknockout pin 29 is flush with the bottom of the recess l9, and the nextheading operation is performed.

As previously explained, the invention may be during the movement ofsaid slide away applied as illustrated to a double stroke header, suchas shown in my prior Patent No. 1,955,061. In this event the punch II isaligned with the cam surface 33 on the lever 3| only during every otherforward stroke of the header and during the alternate strokes adifierent punch is aligned with the die.- This different punch may beconstructed in the usual manner without knockout pins so that theknockout actuating mechanism simply operates idly during the strokeswhen the punch I8 is not aligned with the die 5. Obviously, both punches.could be provided with knockout pins if desired. Similarly the samearrangement that is illustrated may be applied to a single strokeheading punch in which event the punch It, as illustrated, would remainfixed in the position shown at all times. Obviously, the invention couldalso be applied to other types of double'stroke headers in which thepunches are mounted upon reciprocating slides carried on the forwardface of the header slide I.

Although I have disclosed a specific embodiment of the invention, it isto be understood that the invention is not limited to the variousspecific details and that many modifications and variations of thedetails and arrangements of 'parts may be resorted to without departingfrom the scope of the various features of my invention, as defined inthe following claims,

I claim:

1. In a header having a reciprocating slide driven by a crank and pitmanand carrying a punch, said slide being reciprocable between ad vancedand retracted dead center positions, ejector means arranged to eject orfree a blank from said punch, and means arranged to be moved by relativeoscillation of said slide and pitman at the beginning of the retractingmovement of said slide to actuate said elector means.

2. In a header, a stationary die, a slide reciprocable toward and awayfrom said die carrying a punch co-acting with said die, a link pivotedto said slide and arranged to be moved to reciprocate said slide and tooscillate about its pivot during such movement, and ejector meansarranged to be operated by oscillation of said link about its pivot atthe beginning of the movement of said slide away from said die to ejector free blanks from said punch.

3. In a header, a die, a slide reciprocable with respect to said die andcarrying a punch to co-act therewith, a link pivoted to said slide andarranged to be moved to reciprocate said slide and to oscillate aboutits pivot during such movement, an ejector means arranged to eject orfree blanks from said die, and means operated by relative oscillation ofsaid link and said slide during movement of said slide away from saiddie to move said ejector means.

4. In a header, a stationary die, a reciprocable said die.

5. Inaheaderembodyingadieandareciproeating slide driven'by a pitman andcarrying a punch, mechanism for electing a blank from said uncheomprisingapinslidableinthepimcha lever pivotally mounted in the slidefor said pin,'an actuating member said lever slidably mounted in saidslide, and means on said pitman co-acting with saidmember to slide saidpin to elect a blank from the punch during the movement of said slideaway from said die.

-8. In a header, a die, areciprocating slide r driven by a pitman andcarrying a pimch,'mechanism for ejecting a blank from said punchincluding a reciprocatory pin mounted in said punch, an actuating memberslidably mounted in said slide, a lever pivotally mounted in said slidefor engagement with'said actuating member and said pin, and a button onsaid pitman engaging said actuating member during the movement of saidslide away from said die.

'7. In aheader, a stationary die, a reciprocable slide carrying a punchco-acting withsaid die, a knockout pin slidable in said punch and meansto actuate said knockout pin including a pairof aligned rodsslidablymounted in said slide, .a wedge positioned between the ends ofsaid rods and means accessible from a free face of said slide foradjusting said wedge.

8. In a header, a stationary die, a reciprocable slide carrying a punchco-acting with said die,

slide carrying a punch co-acting with said die,

a link pivoted to said slide and arranged to be moved to reciprocate thesame and to oscillate about its pivot during such movement, ejectormeans axially slidable in said punch to eject or free a blank therefrom,an actuating member for said ejector means slidably mounted in saidslide and having one end projecting therefrom adjacent said link on oneside of the line connecting the center of said punch and the center ofthe pivotal connection of said link with said slide, and means on saidlink arranged to engage and reciprocate said actuating member duringrelative oscillation of said link and said slide a linkpivoted to saidslide arrangedto be moved to reciprocate the same and to oscillate aboutits pivot during such movement, a knockout pin slidably mounted in saidpunch, an actuating member slidably mounted in said slide and arrangedto be moved by relative oscillation of said link with respect to saidslide, a wedge positioned in said slide and positioned to engage saidactuating member and to transmit the motion thereof to said pin, saidwedge being adjustable to vary the length of the knockout train.

9. In a header, a stationary die, a reciprocable slide carrying a punchco-acting with said die,

a knockout pin slidable in said punch and means to actuate said knockoutpin including a pair of aligned rods slidably mounted in said slide andextending longitudinally, a wedge positioned between the ends of saidrods, said wedge being carried by a rod extending transversely of saidslide and adjustably and pivotally supported from a face of said slide.

10. In a header, a stationary die, a reciprocable slide carrying a puncharranged to co-act with i said die, a link pivoted to said slidearranged to be moved to reciprocate the same and to oscillate about itspivot during such movement, an ejector pin in said punch, means foractuating said pin including a pair of aligned rods slidably disposedlongitudinally in said slide, means on said link arranged to engage theend of one of said rods and move the same during oscillation of saidlink, a wedge positioned between the ends of said pair of rods, saidwedge being carried by a, rod extending transversely through said slideand piving slide carrying a punch arranged to coact 10 with said die, apitman pivoted to said slide and journalled on a crank for reciprocatingthe slide toward and away'from said die, an ejector rod slidably mountedin said punch, means to limit the sliding movement of said ejector rodin a 15 direction away from said die so that the end of the ejecting rodforms an operating surface of said punch, an actuating rod slidablymounted in said slide arranged to move said ejector rod in said punch toelect or free blanks therefrom.

an abutment on said pitman arranged to engage said actuating rod andmove said ejecting rod in a direction toward said die during therelative oscillation of said pitman and said slide on the stroke or saidslide away from said die, said abutment being spaced from said actuatingrod throughout the stroke of said slide toward said die.

JOHN HENRY FRIEDMAN.

